Why is it even a question? No terrorists. Don’t poise, do it.
“”Why is it even a question?””
What would be the purpose to even invite such people to the US for a conference? WHY not block ALL Visas from there? No question - just blanket - NONE!! They can’t holler “free speech” as those people are not US citizens and their “free speech” is not violated. Don’t spend time THINKING of each and every one - just flat out NO! Is that so hard? If the conference wants RABBLE-ROUSERS, look to the US Congress and invite them! Should be enough!